P
REPARE FOR
A
NALYSIS
It is recommended to perform the tasks in the provided order.
V
ERIFY
R
EGULATOR
P
RESSURE
Verify that the regulator pressure for the nitrogen and helium cylinders are set to a level between
15-18 psig (103.4 - 124.1 kPa).
Check the gas cylinder pressure to ensure that it is greater than 200 psig. Pressures
less than 200 psig may cause the sample to be inadequately saturated, resulting in
inaccurate data or termination of analysis.
V
ERIFY
V
ACUUM
The vacuum level must be better than 20 × 10
-3
mmHg at the instrument inlet. Most two-stage
vacuum pumps, such as the one available from Micromeritics, will provide a vacuum level of about
5 × 10
-3
mmHg.
Prepare for Analysis
Gemini VII Keypad Operator Manual
239-42801-01 (Rev E) — July 2021
2 - 5
